Background

Description

Modify and return the given map as follows: if the keys "a" and "b" are both in the map and have equal values, remove them both.

Format

Input

Output

Samples

"a": "aaa" "b": "aaa" "c": "cake"

{"c": "cake"}

"a": "aaa" "b": "bbb"

{"a": "aaa", "b": "bbb"}

"a": "aaa" "b": "bbb" "c": "aaa"

{"a": "aaa", "b": "bbb", "c": "aaa"}

Limitation

1s, 1024KiB for each test case.